Co-boresighted dual-mode SAL/IR seeker including a SAL spreader
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F41G-007/22
F42B-015/01
F42B-010/62
F41G-007/00
F42B-010/00
F42B-015/00
출원번호
US-0567740
(2009-09-26)
등록번호
US-8164037
(2012-04-24)
발명자
/ 주소
Jenkins, David D.
Taylor, Byron B.
Markason, David J.
출원인 / 주소
Raytheon Company
대리인 / 주소
Gifford, Erica A.
인용정보
피인용 횟수 :
18인용 특허 :
15
초록▼
In a co-boresighted SAL/IR seeker, the optical system and particularly the secondary lens and position of the SAL detector are configured to produce a well-corrected spot of laser energy at the SAL detector. A spreader is positioned between the secondary mirror/lens and the SAL detector, possibly on
In a co-boresighted SAL/IR seeker, the optical system and particularly the secondary lens and position of the SAL detector are configured to produce a well-corrected spot of laser energy at the SAL detector. A spreader is positioned between the secondary mirror/lens and the SAL detector, possibly on the secondary mirror, away from the aperture stop and not in the optical path to the IR detector. The spreader is configured to spatially homogenize the laser energy to increase the size of the spot of focused laser energy at the SAL detector to set the system transfer function to meet slope requirements. Spatial homogenization serves to reduce both boresight shift and slope non-linearities. This approach greatly simplifies the time and labor intensive calibration of the SAL detector's system transfer function.
대표청구항▼
1. A dual-mode SAL/IR seeker, comprising: an IR detector configured to detect two-dimensional images of focused incident IR energy to generate at least one IR guidance signal;a positionally-sensitive SAL detector having a system transfer function that converts the spatial displacement of a spot of f
1. A dual-mode SAL/IR seeker, comprising: an IR detector configured to detect two-dimensional images of focused incident IR energy to generate at least one IR guidance signal;a positionally-sensitive SAL detector having a system transfer function that converts the spatial displacement of a spot of focused laser energy to a target bearing to generate at least one SAL guidance signal;a primary mirror having a common aperture for collecting and focusing laser energy and IR energy along a common optical path;a secondary mirror/lens in the common optical path that creates a central obscuration of the common aperture, said secondary mirror/lens having an aft side facing the primary mirror and a forward side, wherein the aft side is a secondary mirror configured to permit propagation of laser energy there through to the forward side along a first optical path to the SAL detector and to reflect IR energy along a second optical path to the IR detector, said primary and secondary mirrors configured to focus the IR energy to form the two-dimensional images at the detector,wherein the forward side of the secondary mirror/lens is a lens element, said lens element configured and said SAL detector positioned to form a spot of focused laser energy on the SAL detector; anda spreader positioned in the first optical path between the secondary mirror and the SAL detector away from the aperture stop at the primary mirror and not in the second optical path between the secondary mirror and the IR detector, said spreader configured to spatially homogenize the laser energy to increase the size of the spot of focused laser energy on the SAL detector to set the system transfer function. 2. The dual-mode SAL/IR seeker of claim 1, wherein the primary mirror has an outer diameter of at least 3 inches. 3. The dual-mode SAL/IR seeker of claim 1, further comprising a mounting structure that supports the secondary mirror/lens off of the primary mirror, said mounting structuring obscuring the transmission of laser energy from the common aperture to the SAL detector. 4. The dual-mode SAL/IR seeker of claim 1, further comprising: a dome that is transmissive of laser energy and IR energy; anda two-axis gimbal that slews an optical system comprising at least the primary mirror, secondary mirror/lens, SAL detector and spreader about a longitudinal axis through the center of the dome, said gimbal slewing the optical system to an extent that the common aperture experiences vignetting at the edges of the dome obscuring the transmission of laser energy to the SAL detector. 5. The dual-mode SAL/IR seeker of claim 1, where the secondary mirror is formed on a convex surface of the aft side and the lens element is formed on a concave surface on the forward side. 6. The dual-mode SAL/IR seeker of claim 1, wherein the secondary mirror comprises an electromagnetic interference (EMI) coating configured to pass laser energy and reflect IR energy. 7. The dual-mode SAL/IR seeker of claim 6, further comprising a conductive housing around and forward of the SAL detector, said conductive housing and said EMI coating aft of the SAL detector forming a Faraday cage around the SAL detector. 8. The dual-mode SAL/IR seeker of claim 1, wherein the spreader is on the forward side of the secondary mirror/lens. 9. The dual-mode SAL/IR seeker of claim 1, wherein the spreader is a diffuser. 10. The dual-mode SAL/IR seeker of claim 1, wherein the spreader is a lenslet array. 11. The dual-mode SAL/IR seeker of claim 1, wherein no optical focusing element is positioned between the spreader and the SAL detector. 12. The dual-mode SAL/IR seeker of claim 1, further comprising: a flight control system that receives the at least one SAL guidance signal and applies a single calibration offset for all X, Y positions to said guidance signal to generate control signals to control the flight of the airborne platform. 13. The dual-mode SAL/IR seeker of claim 1, wherein the primary mirror comprises a diffractive element. 14. The dual-mode SAL/IR seeker of claim 1, wherein said spreader increases the diameter of the spot by at least a factor of five. 15. A guided projectile, comprising: a cylindrically-shaped projectile body;one or more control surfaces on the body;a dome that is mounted on one end of the body, said dome transmissive of laser energy and IR energy;a two-axis gimbal;a dual-mode SAL/IR seeker mounted on the two-axis gimbal inside the body, comprising, an IR detector configured to detect two-dimensional images of focused incident IR energy to generate at least one IR guidance signal;a positionally-sensitive SAL detector having a system transfer function that converts the spatial displacement of a spot of focused laser energy to a target bearing to generate at least one SAL guidance signal;a primary mirror having a common aperture for collecting and focusing laser energy and IR energy propagated through the dome along a common optical path;a secondary mirror/lens between the dome and primary mirror in the common optical path that creates a central obscuration of the common aperture, said secondary mirror/lens having an aft side facing the primary mirror and a forward side, wherein the aft side is a secondary mirror configured to permit propagation of laser energy there through to the forward side along a first optical path to the SAL detector and to reflect IR energy along a second optical path to the IR detector, said primary and secondary mirrors configured to focus the IR energy to form the two-dimensional images at the detector,wherein the forward side of the secondary mirror/lens is a secondary lens element, said secondary lens element configured and said SAL detector positioned to form a spot of focused laser energy on the SAL detector; anda spreader positioned in the first optical path between the secondary mirror and the SAL detector away from the aperture stop at the primary mirror and not in the second optical path between the secondary mirror and the IR detector, said spreader configured to spatially homogenize the laser energy to increase the size of the spot of focused laser energy on the SAL detector to set the system transfer function; anda flight control system that receives the at least one IR guidance signal and the at least one SAL guidance signal and applies a single calibration offset for all X, Y positions to said SAL guidance signal to generate control signals to manipulate the one or more control surfaces to control the flight of the airborne platform. 16. The guided projectile of claim 15, wherein the secondary lens element is concave, said spreader positioned on the surface of the concave secondary lens. 17. The guided projectile of claim 15, wherein the primary mirror has an outer diameter of at least 3 inches and wherein no optical focusing element is positioned between the spreader and the SAL detector.
Brusgard Thomas C. (Riva MD) McCormick Thomas C. (Linthicum MD) Sijgers Hendrik K. (Reston VA) Smith Corbitt T. (Manhattan Beach CA) Winterble William C. (Columbia MD) Schwerdt Christopher B. (Catton, Millimeter wave and infrared sensor in a common receiving aperture.
English James E. ; White Ronald O. ; Springer James L. ; Schneider Raymond W., Semi-active laser last pulse logic seeker utilizing a focal plane array.
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